What other than doctor can we do with a medical degree?

Answer 1

First, what kind of medical degree, and what type of medicine or health do you wish to study?
You must ask yourself these questions, as in the U.S., your license and type of degree often determines the scope and nature of your practice, IE, what you are licensed to do.
If you have a medical degree from another country, please seek licensing here. This is possible and highly desirable. Complete the necessary courses and do the research to get a proper license.
Beyond this recommendation, with a medical degree that is unlicensed in the U.S., you cannot legally practice any form of medicine here.
To pursue an alternative career like healthcare administration, you'd still have to have a U.S. degree from an accredited university.
Even to practice holistic health, like nursing, nutrition counseling, osteopathy, chiropractic or acupuncture, you would need to go to school here and become properly licensed here.

Answer 2

Medical research, investigator, Crime scene investigator

Answer 3

You could become Michael Crichton.